Compute and display elapsed time of an operation

Do you need help with your Java programming?

Click here for instant help with your Java code.

Sometimes you want to compute the time a certain operation takes, which can be done by using the currentTimeMillis() method of the System class.
The value returned is the current time in milliseconds and by calling the method before and after the operation you can compute the difference in time,
which is the time of the operation.
The example below performs and operation by looping from 0 to 9 and in each loop makes the thread sleep for 60 milliseconds and then displays the time elapsed
between the start and the end of this operation.

/**
* Main.java
*
* @author www.javadb.com
*/
public class Main {

    /**
     * Counts and displays elapsed time between two points in time.
     *
     */
    public void computeAndDisplayElapsedTime() {

        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 10; i++) {
            try {

                Thread.sleep(60);

            } catch (InterruptedException ex) {
                ex.printStackTrace();
            }
        }

        long endTime = System.currentTimeMillis();

        float seconds = (endTime - startTime) / 1000F;

        System.out.println(Float.toString(seconds) + " seconds.");


    }
    /**
     * Starts the program
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().computeAndDisplayElapsedTime();
    }
}

This is what the output looked like:

0.609 seconds.

Do you know your Java?
Take a Ten-Question-Java-Quiz!

Search for code examples on this site

Need help with your Java code? It's secure and confidential.

This is how it works:

Send a detailed description of what you need help with, the more details the better. Also provide a deadline for when it has to be finished. More time means better chance of putting your request into the schedule.

If the request is serious you will shortly receive an email with the price, to which you have to respond if you accept.

Once you have accepted, the work will begin on developing your code by an experienced Java developer. When the code is finished a link to a secure payment will be sent to you.

The source code is then sent to you once the payment is completed.

IMPORTANT! The request needs to be very detailed, else it may be ignored.

Write your detailed request here:

E-mail address: